Minor League Baseball

Feeder system for major league baseball in the United States and Canada. Different levels or "classes" of leagues exist, similar to the division structure in FIFA-endorsed soccer leagues worldwide; unlike those systems, no promotion/relegation exists in minor league baseball (or in any other North American professional sport, for that matter). This is because (a) most teams are semi-permanently affiliated with one particular major league club, which supplies players, pays their salaries and moves them up and down the ladder as necessary, and (b) the differences in stadium size and TVmarket size are much more pronounced between the majors and AAA ball (imagine, say, the Chicago White Sox and Chicago Cubs being relegated in favor of the Rochester Red Wings and Fresno Grizzlies) than in most international soccer systems.

If you're interested in buying a minor-league team, here are some figures for you, from the official Minor League Baseball site:
An entry-level team, playing in a Rookie League, will get anywhere from $650,000 to $1.1 million.
Stepping up, a Class A Short-Season team costs at least $1.8 million.
Single-A baseball is a little more pricey - we're talking between $2.5 million and $5 million.
Teams from the AA Leagues go from between $5.5 million and $8 million these days.
Finally, if you want to bat with the (sort-of) big boys, you can buy yourself a Triple-A team for a cool eight to twelve million dollars.